Terminal communication apparatus, and distributed control system
View Patent ↗A terminal communication apparatus has a terminal communication control portion rendering an immediate communication control portion sequentially transmitting serial data to another terminal communication apparatus bitwise when receiving a packet as bitwise serial data and a normal communication control portion performing processing on the packet after accumulating the serial data until the serial data reaches a packet length when receiving the bitwise serial data switchable, performing processing with the immediate communication control portion in a case of receiving a time adjustment packet containing time adjustment data posting a timing of synchronization in the other terminal communication apparatus and performing processing with the normal communication control portion in a case of receiving a packet other than the time adjustment packet. Thus, synchronization of control object devices can be enabled without previously investigating communication delay times.
1. A terminal communication apparatus comprising:
an integrated circuit or a processor configured to store one or more programs, the one or more programs comprising instructions for:
a terminal communication control portion, and
a terminal time management portion,
wherein the terminal communication control portion includes:
an immediate communication control portion sequentially transmitting serial data to another terminal communication apparatus bitwise when receiving data of a prescribed length as bitwise serial data, and
a normal communication control portion performing processing on the data after accumulating the serial data until the serial data reaches the prescribed length when receiving the prescribed length as bitwise serial data, the terminal communication control portion being configured for performing
processing with the immediate communication control portion in a case of receiving first data which is data of the prescribed length at least containing time adjustment data posting a timing of synchronization in the other terminal communication apparatus, and performing processing with the normal communication control portion in a case of receiving second data which is data of the prescribed length other than the first data, and
wherein the terminal time management portion being configured for performing synchronization by performing adjusting times of timers in response to receiving the time adjustment data from the immediate communication control portion in case the immediate communication control portion determines received first data is addressed to a synchronization group to which the terminal communication apparatus belongs.
2. The terminal communication apparatus according to claim 1 , wherein
information as to whether to perform the processing with the immediate communication control portion or to perform the processing with the normal communication control portion is stored in the head of the data of the prescribed length, and
the terminal communication control portion determines whether to perform the processing with the immediate communication control portion or to perform the processing with the normal communication control portion on the basis of information as to whether to perform the processing with the immediate communication control portion or to perform the processing with the normal communication control portion when receiving the serial data of the head.
3. The terminal communication apparatus according to claim 2 , wherein
the information as to whether to perform the processing with the immediate communication control portion or to perform the processing with the normal communication control portion is stored in the headmost one bit of the data of the prescribed length.
4. A distributed control system comprising:
a plurality of terminal communication apparatuses performing control of control object devices and a central communication apparatus performing control of the terminal communication apparatuses, wherein
a synchronization group which is a group performing the synchronization at the same timing is set to each terminal communication apparatus,
wherein each of the terminal communication apparatuses includes:
a terminal communication control portion, and
a terminal time management portion,
wherein the terminal communication control portion includes:
an immediate communication control portion sequentially transmitting serial data to another terminal communication apparatus bitwise when receiving data of a prescribed length as bitwise serial data, and
a normal communication control portion performing processing on the data after accumulating the serial data until the serial data reaches the prescribed length when receiving the prescribed length as the bitwise serial data,
the terminal communication control portion being configured for performing processing with the immediate communication control portion in a case of receiving first data which is data of the prescribed length at least containing time adjustment data posting a timing of synchronization in the other terminal communication apparatus, and performing processing with the normal communication control portion in a case of receiving second data which is data of the prescribed length other than the first data, and
wherein the terminal time management portion being configured for performing synchronization by performing adjusting times of timers in response to receiving the time adjustment data from the immediate communication control portion in case the immediate communication control portion determines received first data is addressed to the synchronization group to which the terminal communication apparatus belongs.
5. A non-transitory computer-readable storage medium storing one or more programs, the one or more programs for execution by one or more processors of a computer system, the one or more programs comprising instructions for:
a terminal communication control portion, and
a terminal time management portion,
wherein the terminal communication control portion includes:
an immediate communication control portion sequentially transmitting serial data to another terminal communication apparatus bitwise when receiving data of a prescribed length as bitwise serial data, and
a normal communication control portion performing processing on the data after accumulating the serial data until the serial data reaches the prescribed length when receiving the prescribed length as bitwise serial data,
the terminal communication control portion being configured for performing processing with the immediate communication control portion in a case of receiving first data which is data of the prescribed length at least containing time adjustment data posting a timing of synchronization in the other terminal communication apparatus, and performing processing with the normal communication control portion in a case of receiving second data which is data of the prescribed length other than the first data, and
wherein the terminal time management portion being configured for performing synchronization by performing adjusting times of timers in response to receiving the time adjustment data from the immediate communication control portion in case the immediate communication control portion determines received first data is addressed to a synchronization group to which the terminal communication apparatus belongs.